At age 21, the actress portrayed Liesl von Trapp in the 1965 film musical "The Sound of Music." She famously performed the song "Sixteen Going on Seventeen."

After "The Sound of Music," Carr's only other major Hollywood role was starring with Anthony Perkins in the Stephen Sondheim television musical "Evening Primrose." She played a mysterious young woman who lived in a department store.

The actress later went on to write a pair of books about her "Sound of Music" experiences: "Forever Liesl" and "Letters to Liesl." She fully embraced audiences' reverence for the musical, frequently appearing at sing-a-long performances at the Hollywood Bowl.

"I tell people that they should consider sing-a-long 'Sound Of Music' like going to a therapist," she told the AP before a 2005 appearance. "It's just a kind of therapy. They can move around. They can dance and talk back to the screen. They can skip their appointment with the shrink that week."